Smogon University - Pokemon Showdown! has been updated with new HD sprites. Please have a look->

OUTDATED] The Beginner's Guide to Pokémon Showdown

Smogon University - Pokemon Showdown! has been updated with new HD sprites. Please have a look->

GitHub - smogon/sprites: The Smogon / Pokémon Showdown! sprite repository

Create-A-Pokemon - Smogon University

Horo's Trainer Sprite Gallery [COMMISSIONS OPEN]

Resource - SV Ubers Viability Rankings (Post Home)

OUTDATED] The Beginner's Guide to Pokémon Showdown

Legality Changes by Yellow and Japanese Blue [QC 1/1] [GP 2/2] [HTML-ready!]

Sticky - Smogon Sprite Project